personally i will chat to any window cleaner even help as much as i can, as for someone warning me off i could do with a good laugh, once i helped a fellow window cleaner even invited him into my home on several occasions only to find out he was gathering information and try-ed come in after my work, i responded by that's fine try for my work i don't care , i knew none of my custies would go with someone like that, but he couldn't understand why i was angry , i explained i don't care about the work try your luck , but as for come in into my home introducing him to my family and mutt allowed him into my home life , this to me was the line to me this was the insult , but he couldn't understand this, so i told him stay away from my home or you will swim with the fishes, he never came around again, work is work so what there's room for every one, but to come into my home life and try to do the dirty that's a different story, violence is not always the answer to most thing but to disrespect my home life that's another story