Am I an asshole for not being helpful?

[UnknownH]

Hey, that or sarcasm. Might be the best thing.

[Niyara]

I try to be helpful if people are nice about asking.. Otherwise I give them horrible advice, or tell them to ask someone who gives a shit.

[That One Internet Guy]

...thermite demolition charges...

Thermite charges are used to destroy sensitive or small components/objects by burning at extremely high temperatures. Unless you placed them on your school's nuclear reactor, those aren't destroying a building.