Is a person a rasha? Depends on his intention. If his intention is because he thinks this tradition is archaic and disgusting, then I would lean more towards yes. If the reason is because he believes it’s a sakanah and that any mohel could inadvertently harm the baby, then no.
On a side note, what is the source for metzitzah bapeh? The Gemara only says metzitzah. Other than tradition, why isn’t metztzah bakli good enough to fulfill the mandate of metzitzah?