I am so tired of people abusing the phrase ad hominem -- it is not a fallacy to bring in personal details which raise legitimate questions about the credibility

I am so tired of people abusing the phrase ad hominem -- it is not a fallacy to bring in personal details which raise legitimate questions about the credibility of what's being said. Snowden did have a difficult time in HS and he does not possess a formal CS/technical education. He was a sys admin, not an engineer. His claims, in that light, do seem bizarre and uninformed. You've just committed an ad hominem. As if having a piece of paper from a college would make his claims more informed.