As someone who has dabbled in real estate, this doesn't sound all that bad.
Yes, some (most? not sure) such companies did some wrong stuff - and perhaps you were involved (you don't really say, so I'm guessing).
But the category itself? It seems fine as long as they follow the regulations related to price fixing.
When you said you caused great harm in your professional life, I was thinking more along the lines of "being a terrible person to work with", which is probably more in line with the original person you responded to was thinking.
Yes, some (most? not sure) such companies did some wrong stuff - and perhaps you were involved (you don't really say, so I'm guessing).
But the category itself? It seems fine as long as they follow the regulations related to price fixing.
When you said you caused great harm in your professional life, I was thinking more along the lines of "being a terrible person to work with", which is probably more in line with the original person you responded to was thinking.