Seriously its like there are less than five bowser mains who aren't 12 year old little boys who "would never stoop so low as to spam a "cheap tactic" or use a top tier character"
You know, it was very hard looking at this considering how this is very much true to my experience.
Here are some of the stuff that I face:
Ike: AAA Spammers, Smash Spammers, cheap lucky hits
Falco: CG and laser spammers,
Samus: Z-air spammers, Projectile spammers
Pika: Dsmash "Seizures" (My fancy term for spammers who are desperate, or something like that), Thunder spammers, B spammers
Meta Knight: Tornado Seizures, Dsmash Seizures, plus he's broken
Snake: Mortar Slide Seizures, Tilt spammers, projectile spammers, smash spammers, plus he's broken
Link: Boomerang spammers, projectile spammers, Z-air spammers and grab spammers, rely on D-air in hopes of killing sometimes
Toon Link: Fsmash and projectile spammers, D-air constantly, U-tilt and Usmash spam
Lucario: Excessive use of Dodging and sidestepping, Smash and Aura Sphere spam, Counter spammers arent common, but still
Ganon: Side-B to A spam if i get hit by it, Thunderstorming tech spam
Olimar: Grab spam, etc.
Fox: U-tilt and U-smash spams, Blaster spams, runs away to spam blaster, etc.
Wolf: Dont get me started
G&W: Dont get me started
Diddy: Bananas, what else!?
Marth: Well, F-air may be his common move, but there is a limit before it actually is considered spam, and I fought those like that, Fsmash spam in attempts to connect tipper
ICs: CG spam, etc.
D3: CG spam, etc
Lucas: Projectile spam, D-tilt spam, Fsmash spam, etc.
Ness: When at high damage, B-throw for KOs, Projectile spammers, Smash spammers, etc.
ROB: Projectile spam, Sidestep to Dsmash spam, N-air spam if approached while recovering
Pit: Obvious, but not as annoying as the others in my opinion since I have a lot of experience against Pits, plus I use him.
The list goes on, but I would have to say Snake is perhaps on the top of the list, considering how he is able to attack Bowser from long range, hard to kill, overpowered, heavier than Bowser. It's as if they are toying with Bowser and his poor speed. This also happens to my other chars. I cant stand top tiers (though I have used MK, i have not used him often, and Im not one of those type of spammers).
Ppl should stop doubting Bowser, just because he moves slow. There are good Bowser players around.
Though Pit is my new number 1 main now, due to his versatility, with loopable arrows, REFLECTORS, and amazing recovery, etc. I still use Bowser, and am determined to show the noobs out there that Bowser is a great character.
Did i mention how much I hate Snake?
exactly me!! 
ok jk about the hate part.