If one would see a frum Jew acting without derech eretz to others be they Jewish or not, talking loudly, throwing dirt on the floor, bekitzur, not acting metnchlich, wouldn’t that bother anyone? Now what if a lot of frum people did that and that was the accepted behavour of the frum oilim, wouldn’t that cause a flurry of letters to frum newspapers, ranting in the CR or other places where frum people rant?
The very same people who are accepting of pritzus would be the ones screaming that we have to behave, that we can’t make a chillul Hashem.
Pritzus in our machaneh is a chillul Hashem!