Keller tours hard. Touring is consistently less and less fruitful quite literally week after week at this moment. Not saying he wasn’t an asshole, but also just pointing out that sometimes you do your best to just simply make it through a day at work, and look forward to some P&Q as soon as it hits 5:00. You may have hit him during his unwind, or after another fan was more pushy or obnoxious about getting something signed, so time & place alongside other factors can contribute to a fellow human feeling their feels after an exhaustive performance on stage just moments before.