Instead of saying Bidbot Abuse,

Using our combined stake to reduce the value of this post.

Disagreement on Rewards.

In our opinion, you have over rewarded this post via use of the bidbots. :)

Perhaps you were overzealous on your bids for votes.

LOL, you should do a funny post contest asking for fun ways to word it. :)

Just a subtle change of tone is enough in my opinion, but don't stop what you are doing.