Old man at work had a heart attack because I makes a joke about the weather, am I wrong for not contributing money for flowers?

I was on the elevator with an old man this morning. I had never met him before but apparently he works on the floor above me. When we were ascending we exchanged pleasantries and I commented on how it was like “Noah’s flood out there” since there was a rainstorm. He found that so funny he and doubled over laughing. When we got to my floor, I said have a good day and he said the same through intense fierce guffaws. As the door closed behind me, I heard him start to choke and saw him grab his chest. I assumed he was in trouble, but since I had a busy morning I got right to work. There was a commotion shortly after and we later learned from an office-wide email that Glenn from floor 12— the man from the elevator— had been medevaced from the roof. Someone came around later with a get better soon card which I happily signed. But they also asked for a few bucks to contribute to flowers. I had a fiver on me, but I said I didn’t have any money because I always like to keep money on me in case something important comes up. I just told my buddies about this at the bar and they are giving me shit for it. Was I wrong?