My bandmates make suggestions, I listen - and vice versa. But maybe I‘m lucky that we all follow the 5:1 rule: About five supportive and unmistakably positive statements to one constructive criticism. And if in doubt, bring cake as well. 
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It sounds like he's trying to undermine your confidence in your current rig, so that you'll replace it with a new, smaller, lighter rig - that he doesn't have to help schlep.
I wish... at one point he asked if I bring my two 80-90s Hartke XL cabs, each about 80lbs, and my SVT II Pro - that weighs 120lbs. That was the perfect sound. I don't disagree with that. It's just a little much.
I've played for almost 50 years myself. Never had a "suggestion" made about my volume, tone or style in any of the several bands I've been a part of....until this last one: Both the lead guitarist and the drummer have repeatedly told me that "We are NOT going to be a bass heavy band"...
The band is a power trio. ZZ, Who, Trower, Aerosmith, Montrose, etc., etc., etc....NOT a bass-heavy band? How do they figure?
I wish... at one point he asked if I bring my two 80-90s Hartke XL cabs, each about 80lbs, and my SVT II Pro - that weighs 120lbs. That was the perfect sound. I don't disagree with that. It's just a little much.
We have an old saying for this in Texas: "ADIOS!"
I find the idea of one band member dictating another's choice of gear to be suspect.
Have you considered that the OP and others may prefer the tone they get with newer gear?And there you have the source of the problem.
Your drummer has it stuck in his head that the best bass sound is a massive, all tube, Ampeg head, sitting on top of a much more massive full stack.
Yet, you insist on playing through some new fangled, solid state and neodymium foofollah, because you're too lazy to carry around the perfect gear that you already own. He figures if he has to carry around a big ass drum kit, then you can't complain that the massive (but perfect) gear you aren't using is just too heavy.
Have you considered that the OP and others may prefer the tone they get with newer gear?
Wow. Really? lol
Back when I was playing lead guitar, I played thru a Marshall Major stack. Had a nice Trower-like, full tone. Then I joined a band with a keyboardist, and after a couple rehearsals they told me my tone needed a change. I had to lose some of the luscious creamy low-mids and work more in the treble range to make sonic room for the keys. After listening to a couple recordings of our rehearsals, I had to agree with them.
And before that, as a drummer I’d learned from the various players over the years that the tuning of my drums for heavy rock was not the optimal tuning for a jazz trio.
Maybe I’ve just been lucky to have always worked with players who can take suggestions, and can give them without being nasty.