I think the way Leann is using the word mexican is offensive. If we replaced it with any other descriptive constantly with a face of anger I think any word can show a deeper level of racism.
If leann kept calling andy the jew, jew talk, big bad jew. Or gay, gay talk etc etc
I think leann wasnt going to like Lary because she was brought in as dr's friend. She just wrongly assumed she would be scared of leann, but Karybis pretty hateful too so they are on the same level of ugly.