I used to receive the same attitude when I started playing my four Mages. I would get nothing but bashed and flamed, either for gear I was wearing or how it looked the same, or which talent points I chose - this was when I wasn't being accused of being a Chinese Account Seller or Gold Farmer (I even had a couple offers, lol).

As time went on, some people became really cool with it, and would ask me to kill stuff outside of Stormwind just so they can watch the four Mages cast at once. I even got a couple runs through Stockades and SM. However, all in all, it wasn't really worth being in cities just to show off, at least not yet since I am not 70. Thought, for every 1 person that would become acceptable to me playing more than one character at once, there were at least 25 other people who would either bash me.

Factions also didn't seem to matter, on Alliance it was more "omg u fukkin chaeter! you sell accnts!", and horde it was "Well, what you are doing is wrong and completely stupid. I've already reported you, get a life."