You can "FLAG" that particular activity

Hey @Sair, 
Thanks for your post. As @rakeshbhat noted, you can flag the activity.  At this time flagging can only be done via the website. (If you would like to see flagging available via the mobile app, please check out this existing idea: Allow flagging of activities from mobile app).    

Please follow these steps to flag an activity:

1. Determine whether the activity really should be flagged. Please read our guidelines for the appropriate use of the flag tool.

2. Go to the segment page where you see the inaccurate segment time displayed.

3. Scroll to the bottom of the page and click on the date (link) of the activity you wish to flag.

4. Once the activity in question has loaded, click the More Options icon (three dots) over to the left side of the activity page.

5. Select Flag from the menu that appears.

6. Select the appropriate reason for flagging the activity from the list - and please leave us as much detail as possible in the comments box - this will help us quickly and accurately resolve the problem.

Once you've flagged the activity, the athlete's times will be removed from the segment leaderboards for that activity. Once an activity has been flagged twice, the athlete in question will have to have the activity reviewed by Strava Support.

For more information see our article on how to remove an activity from the segment leaderboards. 

The Strava pixies know that riding a horse takes no effort at all so no wonder you are irritated. Equestrians are persona non grata in Strava-world hence I identify as a velomobile… I wonder if this irritates real velomobile users? I’ve seen hundreds of horses but never a single velomobile! Hey, ho! 

 My guess is this person was simply overcoming the recent issue that horseback riding activities no longer sync to Strava at all. So they logged as an activity type that does sync. However, they should have then followed up with changing the activity type on Strava to...something..."workout" maybe? We horseback riders have very limited options, despite it being a very physically challenging activity.....