Any time you own and much less ride a horse, there are plenty of people out there that think you are terribly abusing that horse, that should be running free.
There have been high school kids that have been bullied because they had horses and "everyone knows" people that have them "are beating them with whips and spurring them bloody".
What limits you set to "it's ok to do with MY horses", you will find many others thinking that is abusive.
Perspective can help you understand where others are coming from, why it is not good to stand there throwing stones, when all that have animals are living in glass houses.
Better stick to facts, what is clearly not right, not generalize to "all", whatever all is, is wrong.