ATM, I believe he is talking about jackwagons like this actively fondling weapons in public:
LOTS of people on both sides of the debate took issue with how they (and others carrying similarly) were carrying, resulting in a less than positive impact on the movement. Just like the Westboro folks arent exactly poster children for positive 1A use.
It is possible to exercise a right in such a way that it does not actually further your cause.
What sort of cause is strengthened by hiding it rather than promoting via free exercise? I assure you, the Westboro folks' cause is not the 1A, yet that amendment still stands to protect the free expression of their unpopular cause.
For that matter, popular causes need no protection at all, the majority are fine with them.