@Maddie67 As other host have advised, you have the right to reject the claim/request for additional funds or you can respond stating something along the lines of what you have said here such as "No pets were brought in the home. " Typically the host will be asked to provide some form of proof that this rule was violated. If in fact you did not have a pet, this will prove impossible for him.
Moving on to your complaints.
"Unfortunately we weren’t allowed to have any more than 8 people ( and they had to be on the list to get in)"
This is clearly stated in the listing and identified as a rule/regulation that the city imposes, not something the owner necessary elected to enforce. However regardless of where the origin of the rule came from, it mentioned more than once in the listing, and upon booking the residence you are agreeing to this.
"There’s lots of cameras in the backyard so we just felt like we didn’t have any privacy during our stay. felt like we were trying to stay at our parents house as adults."
Again, this is something listed in the ad. The host clearly states there are outdoor cameras on the property. If you were concerned about privacy you should have considered a booking that did not identify cameras.
"We felt like the price was a little extensive for only being able to stay 2 nights and one full day ( check in was at 4pm and checkout was at 11am) and they don’t allow early check in and late checkout so it felt like more of a rush than a vacation."
As a host this is the complaint the bothers me the most. Prices are clearly stated and broken down upfront. You have a chance to review these, and decide whether to move forward with booking. If the price was to "extensive" you should have considered other options vs knocking your host for what you had to pay. Additionally your length of stay has nothing to do with your host. If you wanted more "full" days that would have been your decision. Every accommodation has check in and check out times, even hotels. 4pm and 11 am are quite reasonable. Airbnb's function a little different then hotels in that there is often less flexibility. Hotels have multiple rooms/spaces to offer meaning they can often accommodate early or late checkouts.
"Maybe it was my fault that i didn’t look into the rules and regulations more."
Again, it is your responsibility to read all the rules and regulations of the accommodation you are booking, as once you press that book button you are agreeing to all those things. It is not fair to dock your host because you failed to fully read everything in the listing. Reviews are very important to a host and a negative one (especially at the start of their hosting journey) can be damaging.