Sorry, this is a bit long and slightly ranty, but do not want to drip feed.
This is a serious aibu and I would value opinions. My 13 year old DS threw away loads of good quality stationery eqiupment that I bought him a few months ago when he tidied his room. I know I probably should have spotted this!
Anyway, he has hidden this from me and I've now found out he has no maths set, calculator and I bought him some lovely fineliner pens that he said he could really do with for school etc.
I don't mind getting the usual back to school stuff, but DS seems to have no respect for things and is constantly losing and breaking his stuff.
I have now found out that he needs replacements, so I will have to take him to get them today. He is a stroppy little so and so at the moment. He also keeps making digs about how me and DP don't earn much money.
Basically DP was made redundant from a good job. I suffered from a serious illness that culminated in my having a kidney removed last December. The company I used to work for were so vile to me about me taking time off for operations and some really serious kidney infections (temperatures of 40 degrees etc, so not malingering), that I was basically forced to qhand in my notice.
Anyway, DP is now doing agency work and I have been freelancing since I recovered from my operation, and I now earn a modest wage. Actually things are getting better for us financially I would say. Every time DS makes these snide comments I feel like a shit parent. 
Life throws these things at you and you just have to get through them. On the plus side we own our house outright though and have no mortgage. 
If he bitches about us being 'poor' why does he constantly treat stuff with no respect and then expect me to fork out for replacements? How is that going to help?
Anyway, apparently he hates me because I am dragging him out on a Sunday. AIBU to deduct the price of the stuff he lost out of his pocket money?