What do you say to those who make fun of you cause linux?

Hi, Im using linux as my main OS, but Im getting anoyed by other guys in my IT class who use windows or mac and makes nonstop fun of me, "cause linux is useless" or it does not have something that windows or mac have. Yeah, outside of gaming where windows is the king I dont see a reason why linux should be considered something less. Please give me some advice in what is linux much better then other two os outside of being opensourse or having more private aproach to user, cause those are not arguments for them. Thank for advice