I would answer
"Thanks to you I am motivated to try vinyasa and hatha yoga, too... just as you build an arsenal of lies I need to create my own arsenal to defend my peace from you at all costs"
Yoga rules!! i love it because I can do it in my home, its free, available any time I need, and I can do it for 5 minutes or 2 hours depending on my schedule.... his comments are among the most ridiculous I've heard...
Or another imagined reply..
"Looks like someone needs kundalini
" LOL.