BTAIM
Be that as it may
Example
BTAIM, I still don't think it's a good idea
Cool, glad you asked
BTAIM definition by Slang.net - The Slang Dictionary
This page explains what the acronym "BTAIM" means. The definition, example, and related terms listed above have been manually compiled and written by the Slang.net team.
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BTAIM (be that as it may) means roughly the same thing as "regardless," "nevertheless," or "sure, that's true, but ..." Basically, it's a way of discounting whatever facts or opinion you just provided.
Someone who sends you BTAIM thinks their plan or idea is best, and you likely won't be able to dissuade them from their course of action. So, you should probably just step back and let them do things their way, rather than continue wasting your time.