Things that aggravate me?
Trying to acclimate a fish while it's determined to get out of the bag and wont stop ramming into the side of the bag, biting it and trying to jump out and your shrimp is trying to crawl all over the bag to inspect the new addition.
What really bothers me the most doesn't even have to do with the LFS or the reef hobby specifically, but it's related. I get really ticked when I go into home depot and get treated from the get-go like I must not have a brain because I'm a woman. Yes, HD employee, I may be wearing heels, but I work in the industrial supply industry and have grown up around tools my entire life. I know what a 90 degree elbow is. I know that I need PVC cement to assemble plumbing (yes I was really asked flat out if I knew that I had to glue PVC). I probably know more than a good number of the HD employees I've dealt with, so it ticks me off when they assume right away I must be clueless and treat me accordingly.