IS IT GAY.....??

...TO BRING A PACKED  LUNCH TO WORK EVERYDAY. i'M ALL WAYS BRINGING BROWN RICE AND AVOCADO TO WORK IN A LUNCHBOX AND LAST WEEK MY CO-WORKER SAID I WAS BEING GAY BY DOING THAT SO i QUIT.
i'M ON THE LOOKOUT FOR ANOTHER JOB BUT i DONT WANT A REPEAT OF WHAT HAPPENED AT MY LAST ONE. i'M NOT GAY SO i TAKE EXTREEM OFFENCE TO BEING CALLED IT. WAS MY CO-WORKER JUST A KACKASS OR IS IT A COMMON ASSUMPTION THAT BRINGING A PACKED LUNCH TO WORK EVERYDAY SIGNIFIES GAYIETY??/