I haven't been on too much over the last week or so, so someone only pointed this out to me today.
We just need to do what we did last time they did this, and also how you should respond to any /b/ raid, by just ignoring them the best we can; as boredom is the greatest weapon we have against the spammer.
They're not doing this because they like what they are spamming, they are doing this because they like the reactions they are getting.
For the next few weeks, just don't browse recent images, just go directly to the home pages of the memes you like and this will all blow over soon.
The more people who take the bait, the longer this will go on for.
If you feel like being more proactive, just use this time to upload your own content to the memes you like, but are just not very popular.
Uploading content can be done in a few minutes, it's the double-checking to avoid reposts and searching for/making the buggers that's the time consuming bit.
If we can show them that their actions have only led to more variety instead of less and their efforts, which from personal experience I can tell you is quite time consuming, are all for naught, then they might just piss off quicker than before.