Males's odd behaviour towards my 3yo DS?

[Triggles]

When out yesterday with another mum and children (so a total of 2 mum and 3 children), we went to a secondhand furniture shop (reclaim shop). Anyway, a number of employees around, but one particular employee (male) followed me and my 3yo around a bit in the shop, even though I did state we were just looking around, not ready to make a purchase yet. At one point, while I was standing still looking at a wardrobe, with DS standing nearby, he starting chatting to DS quietly. I couldn't hear what he was saying to him, even though he was close by. Then he reached out and tickled DS twice (in the tummy area) and I heard him say "Are you a wicked little boy then?" So I said "No, he's not," and took DS's hand and walked to another part of the room, where the other mum was.

I found it all a bit puzzling. This man completely ignored the other children with us and focused solely on my DS. He didn't follow anyone else, and when my son at one point walked between myself and the other mum (right where I could see, but walked over to her briefly), he followed DS, not me. So it's not like he was looking to see if I needed assistance with a purchase. And there was absolutely nothing in the near vicinity that DS could break - it was all furniture, no little breakables.

I have turned it around in my head a number of times, but still feel his behaviour was odd. I actually did see an item of furniture that I was interested in purchasing, however, I was hesitant to speak to him and give my home address for delivery based simply on this particular man's behaviour. AIBU to avoid this shop due to this or is my imagination in overdrive? What would others here do?

I've tried to put all the pertinent information in this first post, so no AIBU by stealth or anything, if I can help it. As far as his description (as I know some will ask), he was a white male in his 20's, a bit scruffy, but then, so were all the other employees there, and I didn't get that uncomfortable feeling from ANY of the other employees, only him. (plus he was the only one that approached my son, other than a friendly hello to him when we walked in)I don't want this to degenerate into a screaming "omg every male is a pervert" thread. If he had done anything obviously out of order, I would have spoken to the management at once. However, it just seemed odd to me, so hence my question.

So...AIBU?

Asana - true, but then would you completely ignore 2 children and focus only on 1 of them? If he was just chatting with all 3 children, I wouldn't have thought much of it. I think it was just the combination of all the behaviour that made me take notice. And DS wasn't being playful. He was just walking next to me, for the most part not even looking at the male, until we stopped to look at the wardrobe and the male started speaking to him.

I'm quite well aware that "nothing happened" which is why I didn't make a big deal of it, nor did I speak to the manager about it. Therefore I don't feel that I overreacted. I simply wondered if anyone else would have felt uncomfortable in that instance, and was IBU to avoid a purchase there that would require giving my home address due to his behaviour.

I've worked in law enforcement for a number of years, so I'm aware of what's out there. I generally am not an alarmist. If I saw a male taking photos in the park, I would assume he was taking pictures of his child and not worry about it (I say this particular example as I know it's come up recently on a thread). I'm also fairly well aware of where the line is drawn from a legal standpoint of actually doing something wrong.

I actually did ask DS what he had said, but he's a bit young and didn't really give much of an answer at all. As far as if it were a woman - well, I would imagine I would have been slightly concerned as well, because she would strike me as a bit of a nutter based on the behaviour. I'm trying to place a woman in the scenario instead of a man mentally, and I think I would still think they were a bit off and would react in the same way.

YANBU. I agree with most on here, always trust your instincts. I get a funny feeling about certain men (and always have done from when I was little) and I never ignore it. If I am wrong, never mind, I hopefully won't see them again. But if you are right and ignore your instincts....

Its interesting about some people commenting on if it had been a woman. Once I had DS in the pushchair and some woman came over and pinched his face. I didn't like it tbh. I just don't like strangers touching my child in anyway. I am the same if a stranger touches me. I always try and keep a distance in queues and stuff and it does my head when people (men or women) get too close to you.

Also the comment about "wicked little boy" I wouldn't like that from a man or woman either.