Sure, that'll stop you from getting stressed over what people say but in the long run it'll also cost you as any hypothetical friends and suchlike learn to not even try to talk to you about anything as you're not really listening anyway.
My advice would be to save the 'meh' for random strangers and people you do know but still don't give a rat's ass about.

Oh, and feel free to omit posting the meh-reply to this. It's assumed anyway.