Makes sense. Same as how a joke shop on Diagon Alley survives when you'd really only expect big business in the pre Hogwarts rush.
For what it's worth, this came through loud and clear for me. That attitude shift was portrayed will.
•Old school suppliesWhy is everyone presuming it's the past?
True enough, but the reason she is an outcast is that she 'can't' use magic, it doesn't matter (much) that she in truth can, they are outcasts for the same reason.
I don't know about Titania, but The Ogden family are the manufacturers of Firewhiskey
The reason Filch considers Hazel a Squib is exactly what you said. Nonhuman sapient magicals. Except she isn't nonhuman. Her parents were human, a wizard and witch even. So she isn't a nonhuman nor a half-breed, nor even a Muggle whose humanity is debated among certain slices of the wizarding world. She has to be given a human label, to be put in a box with the word 'human' written upon in.
Considering her lifestyle, this one line tells a whole story by itself.
I don't know, enough people had a reaction of "I heard african wizards could do wandless Magic but I've never seen it" to imply they recognize wandless magic as been done by wizards and witches.
There's also a Bob Ogden mentioned in book 6, he's the Ministry guy whose memory introduces us to the Gaunt family.
The thing here is that wandless magic isn't just wandless magic – lots of magic, including literally all magic that isn't done by wizards, doesn't use a wand. Wandless magic is wand-using wizard magic mastered sufficiently well that the wand becomes unnecessary. That's different than a completely separate tradition of magic with different implements and effects.
I'd expect that students that have families might like to occasionally meet up with them during Hogsmeade days. Have lunch together. Hug their little sibling - who might just want to run off and buy some sweets after.
I think it probably wouldn't. It's not like there is actually anything different about Hazel from other wizards from a magical perspective, she's just practicing karate while they use boxing. If Hazel didn't have her staff and wasn't mute she would be able to use wizard wand magic just fine. Filch on the other hand seems to not have magic at all, it's not that he can use a wand it's that he isn't magical in the first place.
I think seawrosse should be saewrosse, unless there is/was/will be a Professor Waesley.
I thought squibs were at least partially magical.
It really depends on what muggle repelling wards target. Does it target a lack of magic? If so squibs should probably be effected. Does it target people who don't know about magic? He's fine. The esoteric concept of muggle? He's fine.
It also seems to be rather unexplored or uncommon knowledge in-universe, which is why Mrs. Figg's testimony about seeing a Dementor was accepted.
