Is it illegal to curse at someone or flip someone off in public?

In most cases, it is a misdemeanor and such is against the law but depends on the context and variables as to how it is upheld. Most times, police and judges will not even mess with it even if someone wants to press charges. The only times I have seen it upheld (and sometimes excessively) is tied into road rage or racial hate crimes laws by doing either cursing or gestures in that context.