I think this is discrimination, how do I deal with it?

I would be tempted to make a complaint. That's really out of order.

I recently left my college course because I didn't feel the course accommodated long term health issues. I got a job and started work.

one of the tutors on the course was unprofessional about me whilst I was on the course, told people I was bulimic, slagged me off to other pupils and kept saying I needed to man up and sort myself out. eventually after meetings of this and various emails calling me "chaotic, unmotivated, a mess" I left the course.

when I left, I just said I felt too sick to be there, rather than I was sick of being discriminated for. I didn't want the hassle.
some of my class mates stayed in touch after I left, and have said the tutor has made comments about me to them personally over the course of several weeks of me leaving. he has said I am, uncommitted, will get nowhere in my life, making up excuses and wasn't even that sick. (I suffer from a long term health problem and am currently under hospital observation, they were aware of it) he also called an autistic guy unorganised and embarrassing.

the worst thing is, this tutor comes into my place of employment once a week for work experience. where I feel even more uncomfortable. he's still quite rude to me and I don't exactly like having him around.

should I ignore everything that has gone on and wait for him to calm down and move onto someone else - or should I stand up for myself?

please help, this is making me really down.