Wa alaikum assalam,
If the wearing of certain clothes or following certain traditional habits is practiced as optional and not as a ‘religious command’, then I personally see no problem with this. However, if it is asserted that a certain cultural practice of a people has to be followed as a compulsory part of religion, then this is arguable.
With regards broad statements about certain people to infer that they are all evil / with dubious intent is not a Quranic stance. The Quran recognises good and evil in all people and communities.
I hope this helps, God willing.
Joseph.