Does Venus trine Neptune mean I idealise people?

It describes a tendency for the outline of what you find lovely to soften, and idealisation is one common form of that. It is a pattern rather than a verdict, and the rest of a chart has a great deal to say about how far it goes.

What does the tradition actually say about Neptune?

Very little, in the sources this reading works from. Neptune is classified as an outer planet, found long after the classical tables were set. That silence is worth stating plainly rather than filling in.

Is a trine to Neptune better than a square to it?

It is easier, which is not the same as better. A square to Neptune tends to force the question of what is real; a trine never raises it, so the softening stays comfortable and stays uncorrected.

Aspect

Venus trine Neptune

Venus trine Neptune is finding it easy to see the best in something. Venus is what registers as beautiful. Neptune is the outer planet associated with dissolving edges — including the edge between a thing and what you hope it is. In easy contact that softening is pleasant, and it is not always accurate.

It is the most flattering of the love trines and the least reliable as a witness.

The body the record says least about

Of everything read for love, Neptune is where the formal ground is thinnest, and saying so is more useful than dressing it up. It is classed among the outer planets. Its subject is dissolution, imagination and what has no clear edge. The classical tables were set long before it was found, and it was never written into them. Almost everything commonly said about Neptune and romance is interpretation resting on a classification and very little else.

What the classification does support is this much: Neptune is slow and impersonal, so a contact to Venus is where something generational meets a private preference. What gets blurred is the boundary of the thing you find lovely — not your judgement in general, only the outline of that one appetite.

The trine makes the blurring comfortable, which is the difficulty rather than the benefit. Idealisation that costs nothing does not get corrected, and there is no friction in this contact to do the correcting.

How it tends to show up

Falling for a version of someone, and being genuinely surprised to meet the person.

Music, film or paint mattering considerably more than they do to most people.

Forgiving quickly, repeatedly, and without much sense of having decided to.

Finding it difficult to name a preference precisely, while feeling it very strongly.

What changes the reading

A trine is allowed the same room a square gets, and it is a quiet aspect at any width, so a wide one is easy to overlook entirely.

Neptune’s sign is shared with everyone of a similar age and says almost nothing about an individual. The house and the contact carry whatever is personal here.

A Saturn contact anywhere near Venus supplies the edge this one dissolves. A chart with both tends to alternate between the two rather than average them.

Questions

Does Venus trine Neptune mean I idealise people?: It describes a tendency for the outline of what you find lovely to soften, and idealisation is one common form of that. It is a pattern rather than a verdict, and the rest of a chart has a great deal to say about how far it goes.
What does the tradition actually say about Neptune?: Very little, in the sources this reading works from. Neptune is classified as an outer planet, found long after the classical tables were set. That silence is worth stating plainly rather than filling in.
Is a trine to Neptune better than a square to it?: It is easier, which is not the same as better. A square to Neptune tends to force the question of what is real; a trine never raises it, so the softening stays comfortable and stays uncorrected.