I would assume it will be the same as undergrad, or better.
I can tell you about my experience in undergrad as a nontrad. I took courses full time, during the day. Pretty much NOBODY cared. If they did, I just chocked it up to immaturity and moved on. I can't control the reaction that someone has to my presence, but I can control how I respond to them. I would hope that the maturity level would have risen for vet school.
The majority of the people I studied and had class with did not notice (or care to notice) how old I was. [One girl, with whom I had at least 4 class, did not know I had kids, even though I brought them to study sessions, and exam reviews.
] Now, the social aspect may be different. I did not have the time to go to bar A and social gathering B, so I didn't develop those kinds of relationships. I had work, a few clubs, and family. I guess, it would be the same as a student that needs to work through school. They wouldn't be as social, but they would be in class.
I've heard from nontrad friends (that are currently in vet school), that the trad students don't care what color your hair is, if you've got the right answer. Also, they may not get some of your cultural references, but if you were kinda off the mainstream when you were younger, they wouldn't get the joke, anyway.