I think so many people believe if they don’t find something annoying/upsetting then neither should anyone else
and oftentimes it’s only theoretically so, as in they’ve not experienced it at all but feel confident that they wouldn’t find it weird etc with neither evidence nor experience of it
I’ve direct experience of an older man who’s whole schtick was “I love kids me”, coupled with singling out kids away from their parents and followed by offers to ‘show kids x, y, z and/or take them on short trips’
and all the adults without exception thought this was normal & desirable “how great that they’re company for each other”
all it might have taken was one adult to use their brain : “Hang on, he is constantly trying to make kids his friends, he follows this by normalising those kids spending time alone with him, he ‘dumps’ older kids and is always encouraging the youngest”
but nope, not even when those ‘dumped’ older kids started to display mental health issues, not even when 4 attempted to kill themselves
not even when one child spoke up
in fact some parents deliberately encouraged their children to spend with him in order to prove that they trusted that creepy bastard more than an innocent child
honestly the depths of naivety at best, wilful bloody stupidity at mid point, up to and including the worst (collusion/shared perversity) of some adults when it comes to abuse of children is utterly breathtaking
in our case 2 of those children are dead, and at least a dozen left with severe mental health issues into adulthood
but many, many of my generation’s parents still talk fondly of this filthy bastard and ‘how much he loved children’
OP do everything you can to assert that whilst saying hello to your family (adults and child together) is fine, encouraging your very small child to engage 121 is not appropriate
if he’s really a nice person, who actually cares about children’s welfare, then telling him you are starting to teach your child about boundaries etc will be taken as a sensible and normal thing especially for a child getting ready for nursery/school attendance when they’ll be with adults other than parents
if he gets annoyed or dismissive and tries continuing to engage your child without you or DH then you know he isn’t really someone who likes children, he just wants unfettered access to them
and as a side note - allowing adults to circumvent a child’s boundaries at an early stage can have devastating repercussions for life. I was primed to believe adult men’s wishes took precedence over my own needs, that they ‘deserved’ access to my body and that I had no right to say no
my entire life has been blighted by adults believing the ‘nice, old man’ and it all started with him calling us over and encouraging a relationship without other adults present
if he’s as fine and normal as PP think then you are not destroying his life by stopping him engaging with your child alone
the consequences of teaching your child that an adults’ wishes supersede their own are, in contrast, potentially devastating