By submitting a suggestion, you are accepting any and all criticism that comes with your suggestion. Please do not take any deconstruction of a suggestion as some sort of an attack against you. If you do however believe someone to be attacking you, you are more than welcomed to report the post/the user.
That said, to all of the people who choose to critique suggestions, please remain polite. Constructive criticism is always welcomed and will never lead you to trouble. If you stumble across a bad suggestion, explain why the suggestion is bad and how it can be improved or why the suggestion should just be scrapped. If you stumble across a good suggestion, you're welcomed to give the suggestion support.