Yes, he got all tough guy on the phone with foyet saying he's the one 'that goes after bad guys like you' and that enraged foyet and made it personal for him so he went out that night and killed all the people on that bus then made it a vendetta to go after hotch and his family.

Hotch should know better than to get emotional with psychos like that - it wasn't professional or smart, case in point look what happened later to his family...

hotch is only human, he made a mistake and lost his temper on the phone with foyet, but look what cascade of events it started.

being irrational like that wasn't smart. AFTER foyet went after his family is when being irrational makes total sense then, but not before...

Yes, but its totally understandable. I actually like it that he was irrational, cause it lets us know that he's human, instead of this unfeeling workaholic, who doesn't appear to care even when his family is in danger.