R’ Yakov Kaminetzky suggests that the presents is also copied from us (though perhaps he meant from our giving gelt).
Another example: R’ Akiva Eiger in beginnning of Hilchos Tefilah – we no longer daven with our arms raised, because they copied us.
I would imagine the issue is doing avodas Hashem in a way that looks like them, even if they copied. Does anyone have such examples which we didn’t stop ?
Other things would just be a question of “bechukosayhem”, which depends mainly on motive, as was pointed out above from R’ Moshe.