Definition: Given a real-life anecdote of a complex ethical situation, generate a suitable title that describes the main event/root cause of the situation. Imagine that the given text is a social media post, and you have to write the title of the post, so the users can decide to read the main text or not.
Input: So I (20 M) live with three other people (20 F, 20 F, and 18 F) in a suite. The four of us generally get along pretty well and I get along super well with my roommate. She and I are in year 3 of living together. We're all STEM majors except for the youngest one and she is also the only one of us who's vegan. I don't necessarily mind the fact she's a vegan at all, except that eating with her becomes really really tiresome because it quickly becomes a lecture about morality, how she's doing less damage, you're a terrible person for eating meat, etc etc. Basically, you can't just enjoy a meal together because she has to say something. 

She's also tried to lecture me over my insect collection for entomology. I'm currently enrolled in entomology and hope to go to grad school for it. The collection required me to kill and pin insects, and she kept telling me how cruel it is, their blood is on my hands (never mind the fact insects have hemolymph, not blood, which I wanted to tell her but did not because I figured it wouldn't help), etc etc. as if I enjoyed the action of having to kill 40+ insects to display their dead bodies. I had to do it for a grade. How else do you think they get insects you see pinned and displayed like in museums and insectariums? 

Whenever she used to ask to eat with me, I'd make up some lie about how I was waiting for someone already or I had to leave soon anyway. But I've had a rough month and this time I straight-up told her no because I wasn't in the mood for a lecture about my meal. I also told her I'm fine with her being vegan, but her guilt-tripping and lectures on morality are seriously getting old fast and makes being around her something I don't enjoy. AITA for telling her I don't want to eat with her and why?

telling one of my suite mates that I don't want to eat with her