Avram,
1. In fact, in many countries the Jewish community is called the Israelite community. In any case, the connotation of a word differs according to the language. In Polish “zhid” is a regular word whereas in Russian it is a pejorative. Similarly, if one were speaking in Yiddish “shvartze” would not be pejorative but if he is speaking in English it is.
2. Wearing tzitziot outside for pride is like putting up a mezzuza as an amulet. Rambam says about the latter that one loses the mitzva.
3. A kippa seruga is not a fashion statement but a statement regarding one’s hashkafa.
Beee,
1.It is a chillul Hashem if the person is not on such a high level as people judge him more stringently. In a pace where that is not the custom it is also haughtiness.
1. Actually, the poskim did away with some customs, such as covering one’s face during the shiva, because others made fun of Jews.