@Frank1311 If you book a hostel type listing, you have to expect that not all the other guests may be respectful of others and may have annoying habits, not clean up after themselves, help themselves to others' food or shampoo, etc. That is generally the nature of house sharing with multiple unrelated guests, whether it's an Airbnb or simply a shared house long term lease situation.
If it was just one thing, like not cleaning up in the kitchen, I'd say to speak to that guest, but there are so many disrespectful issues that I don't think it would be productive.
What you should do is contact the host to make them aware of the behavior of this guest, who obviously isn't suited to sharing space respectfully with others.
Have you spoken to any of the other guests to see if they are being disturbed by this person? If they are, the more guests who make this known to the host, the better.
If the host declines to get involved, or the guest ignores the host's warnings and is still allowed to stay, your only option is to look for another place and cancel the rest of your stay.
This listing actually sounds quite illegal, given the COVID restrictions in Ontario. And highly dangerous for you and the other guests as far as contracting and spreading the virus.