I don't think she realises that- telling her you find it offensive (as would most ppl) is a great step.
Phrases like: those ppl, your kind of ppl... actually could come up from ppl trying to be oversensitive (and probably not comfortable) with the defining marker- in this case homosexuals but could apply to race, nationality, religion...What they don't realise is that it does have a negative connotation (I/we as opposed to them or implicature of other characteristics that these groups have in common)