> If you don't know this and don't remove these tags, you find that they will set off the exit/entry scanner at various stores unrelated to where the item was originally purchased.

Literally never happened to me, which makes me question the validity of both "a lot of the clothing you buy has RFID in tags sewn into the item" and "if you don't ... remove these tags, you find that they will set off the exit/entry scanner at various stores"