It's great you love riding your scooter but I think expressing your joy by beeping is not the best way to go. There is already enough pollution in our cities, including noise pollution. We shouldn't add to it. Also, the horn is meant to alert others to a potentially dangerous/important situations, so it shouldn't be used for no good reason.
Finally, there is already an established tradition between two-wheel users of nodding at each other. Admittedly used mainly by bike riders but scooters are also two-wheel vehicles so there's no reason why you shouldn't join in :)