原句应该为 the table manners doesn't bother me like they used to (bother me.)省略掉了与前面一致的部分.又如:I like apples ,but she doesn't. 本句也省略了前面相同部分like apples.明白了没有?!
前面已经有了,所以后面就省略掉了,完整为:the table manners don't bother me like they used to do.当然最最完整的表述应为:the table manners don't bother me like they used to bother me.并且这三种表达都完全正确