Just ignore them. Very few horses should be bred. Only the best of the best and if he isnt up to par then there is nothing wrong with cutting him.
You honestly are doing what is best for him. Stallions lead a lonely life and many great geldings are ruined by remaining intact. Its more difficult to house/board a stallion, handle a stallion, it takes money to advertise a stallion.
Its very wise and mature of you to make this type of decision and stick with it. If he has a full brother already winning, then people that want the pedigree he has can breed to his brother. While you can reap the benefits of having an amazing gelding!
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