Not surprising that this wisdom comes from someone who has dedicated her life to animal welfare.
As Brene Brown teaches, shaming someone doesn’t work. Accountability (as some posters offered the OP) does. But saying you’re a bad horse owner, or you’re selfish, or you obviously care more about other fixtures/conveniences than turnout, just makes someone close their ears.
Also, if a poster on an online forum makes you feel UNSAFE, stop participating in that forum (this is sincere advice). At the very least, do not engage that poster. (Again, sincere advice). There are plenty of other places to discuss horses on the Internet.