First, a big congratulations on your achievements
in martial arts.
In general, I think the best
defense is to ignore it -- to just change the
subject -- otherwise you become emotional and
they become more entitled. I think that you
should just prove to them by doing.
and success will eventually prove them wrong.
And also know that because you are breaking
barriers -- you are probably one of the few girls
pursuing this -- you are likely to continue to
face this challenge, but will ultimately make
it much better for those who come in your foot