I'd go with 'sometimes' - on a very basic level some will be totally understanding and cool with it, where as others will start treating you like you're simple minded or even use it against you as an example of you not being able to work like others in the class.
I didn't know about asperger's/autism when I was in school/college.
In school whenever there was group or presentation work I'd skip class and get into trouble or fail the course, I was in and out of special classes, constantly bullied and teachers just used to give-up on me because they didn't understand. In college I was excluded by other students in class, and when issues arose I couldn't explain myself so then went into meltdowns which caused various problems with teachers and student support staff. I think if I had known about it then I would have told them because I think it would have made life easier.
I'm in college part-time now as an adult, I was being excluded by other students so I was unable to take-part in class which was then effecting my learning - I had no choice but to approach learning support (they didn't have this when I was at college first-time round), who were hugely helpful, turns out the teacher thought I was choosing to sit out of group work. Her knowing has been helpful as now I can be excluded...the autism support team at college seems great so they will help rather than punish as they did my first time in college.
The issue of diagnosis is a problem though - learning support seemed to make an issue of 'proof', as I have none I just mumbled a bit saying I didn't know exactly when I was diagnosed as I was scared they'd no longer give me support if they knew I was awaiting diagnosis. I think you do get this problem a lot, which I personally think is wrong because fair enough you can't say you're autistic or an aspie without diagnosis...but you still have the same issues so may need support or understanding.
_________________
Bloodheart
Good-looking girls break hearts, and goodhearted girls mend them.