Don't listen to them, they're just being ignorant. The baby doesn't care what he wears so long as he is comfortable and warm enough and tights were completely normal on boys in the 70s and earlier. Personally I hate jeans and trousers on baby boys, I think modern baby clothes are making babies look like little men when I think a baby should look like a baby. He doesn't get that priviledge for long! My baby boy wears tights most of the time, he has white ones, red ones and navy ones and they look very cute indeed, especially with a cute vintage romper suit, or knitted shorts. I bought them from the girls section in mothercare.
MORE TIGHTS ON BOYS!