No, you’re not doing tricks with an electric scooter in a skate park. If you’ve never entered the park with anyone else there then who are these people that are giving you shit about it and why are they wearing helmets?
You’re just being an invasive prick, point blank. It’s not me telling you what to do, it’s just basic etiquette of the park, it’s not a place for electric scooters. There’s a valid reason these people are telling you and your entitled attitude to fuck off. You’re ruining the experience and purpose of the space.