I don't mind it in moderation or in casual conversations via email or text. But, I definitely think that when you're dealing with a more professional situation, or a situation like your's, at least an attempt to sound intelligent is important. It bothers me, and I am fortunate that I don't see much of it at all. Good luck finding a home for your foster, but I'd probably pass on that email just as you're doing. For the record, I rarely even abbreviate in a text message. And, I still don't use "LOL."