Is it rude to watch the repair man/woman?

I’m a new homeowner, and I like to watch the repair man/woman and see how they fix things. For example I had a leaky pipe, and I kind of hung out in the kitchen and observed to learn how they fixed it. A year later I installed my own kitchen sink by myself! I wonder if it’s rude, because one time the repair man said “Can I help you?” when I was hanging around my living room as he repaired our electrical outlet… something I’m trying to learn so I can install new light fixtures.