Also traditions that, despite someone else's claim, probably don't cause any psychological harm, at least most of the time.
Actually you asked for nothing, you made a whole lot of assumptions instead. And
evidence that it hurts anyone
Here again you invalidate the feelings of those telling you with their own words that they don't like it. The evidence they don't like it is them telling you they don't like it, you don't need a scientific paper to corroborate that some people find it objectionable, you just dismiss them because you want to partake in the behavior they find objectionable.