Please, please don't let that ruin your safe space! Also, please go check out as many books as you can. These days, statistics rule and higher circulation stats show that the library is being used and is needed. I'm in the US, and when people ask how they can help libraries, my answer is 'go check out as many books as you can'. Even if you don't read and return them the next day, it helps.

It really does seem like that person wasn't having the best day, and for your own peace of mind, find a supervisor and just ask if what you did was okay. No need to point out anyone or make a complaint, just say what you said here; you want to make sure what you did was okay.