This cold shoulder business is the opposite of all midos tovos. Perish the thought. Chas vchalila. One can be extremely warm and kind, and still not cross any lines. One should greet everybody b’sever panim yafos, offer to help in any way, ask them how their day is and how their family is doing, etc.
Only with extreme warmth is the essential message of yiddishkeit transmitted. Still, one doesn’t have to touch anybody, or get involved with anything off-color. Just be warm and kind and friendly and outgoing. It is so pashut, I don’t even know what is the shayla.