Lol, if i were you.. i'll go crazy too.. no idea why nowadays ILs are SO irritating n childish.. maybe your father in law need attention, thats y he make such a comment ..
My father in law almost same as urs, i used to tell him back what i was doing.. but now, i would rather keep quiet, smile n nodd my head. It'll be damn irritating if i reply, he will act like his has all knowledge n criticized pple.. but from what he say-mostly are rubbish_duno act know those kind.
My father in law can complain whatever they can think of.. by just reading newspaper, he can make alot of noise in just one article.. as for watching news, he will be like - woah! you see those..blah blah blah - as if he first time see news like this.. phrase to describe- 'Frog living in the well'.
Another bad habit of him was betting.. always spending his money on 4D/TOTO, when knowing hes lacking of cash, he tends to borrow-(hokkien: tei chui zai). Worst is everytime bo tio, he will be ranting in anger those who didnt buy n say 'see ! your numbers open up at first prize! Ask you buy you dont buy! If you buy, by now you will win....' n he start calculating the money.. Always n standard the few words.. "if i tio, i buy this this that that.. bring you all go overseas" - but truth is when he tio he keep quiet awhile then tell everyone n he will spent all his winning onto it again n history repeats.
Hes super money minded, a small issue regards to $ he kpkb n keep counting. Usually me n my hubby every once a month would bring the whole family to eat something better instead of daily rice n noodles, bringing them to a slightly expensive place e.g japanese restaurant, father in law will make alot of noise 'wah! One plate of this cost so much..blah blah blah..' Gosh! Not his $ he also care.. going out with him will feel very disgrace ..