armchair perfectionist

A person who declares everyone else at fault for any problem, while they themselves claim it's not their responsibility to help solve the problem. They absolve themselves from anything remotely challenging that might tarnish their appearance of blamelessness, especially with technology issues. They love assigning blame while remaining safely removed. They also like to point out how other people inconvenience them.

The armchair perfectionist blamed his wife and kids for the wifi problems, saying "I didn't have anything to do with this. This is all on you!"