because people speak English
If some one doesn't reply that surely doesn't mean he/she is rude! he might busy and discussing somwthing :))))
we are at the chat to enjoy our selves practicing knowledge in English. One needs not be shy as no one judges anyone relax and enjoy :)
when i came to EC first time i was really shy and my English wasn't good at all, but the help of some members i really improved faster, we used to discuss about Grammar and some tips that lighting out way, (when chairman asked me and i didn't know "Ida was helping me in private :D)..