Most hated Mario enemies/obstacles?

[Nooga Productions]

Reznors in Super Mario World.

This sure gives me goosebumps then and it's almost scared me.

[Cedur]

I was scared of Robirdo when I was a child

[FireyPaperMario]

I was scared of Robirdo when I was a child

That character sounds like it's a boss from the Gameboy Advance port of Super Mario Bros. 2 USA...

[FireyPaperMario]

Did anyone in the history of this SMBX video game forum topic mentions the third Kamek fight in Paper Mario: Sticker Star? If so, I hate how he clone himself in twos at the start of the battle* and also changes all of your stickers into freaking sandal stickers so it'll be hard to not use a really good one.

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*It's like you MUST get 3 matching icons at the start to even stand a chance if you're max HP is below 80 imo

[TheNightingale]

Lakitu has always been really annoying to me. Levels become a huge mess everytime he shows up.

[TheGameyFireBro105]

I was scared of Robirdo when I was a child

That character sounds like it's a boss from the Gameboy Advance port of Super Mario Bros. 2 USA...

it is

[thegameseum]

Stretches. I don't know why, but they've always been annoying to me.

[Lucario]

I don't hate any enemies. I like em' all, but some can be QUITE annoying to defeat. That's why I love them, but here it goes, most annoying enemies:

Venus Fire Traps - Mostly in 9-7, those fire-spitting plants melt the icy floor you walk and you simply DIE A LOT!
Wild Needlenose Piranha Plant - In YI they're annoying because they predict your movement and launch the Needlenose at Yoshi! In SMBX, is worse! I made a level all about them and I regret trying to clear it! I placed them in such places that is almost unavoidable to be hit by one or two Needlenoses!

Added in 2 minutes 20 seconds:

1. Blooper
He's always chasing you, he never leaves you alone. They're the reason why I was stuck on World 3 in SMB3.

Wait till you see Rip Van Fish *traumatazing flashbacks*

Added in 4 minutes 27 seconds:

Reznors in Super Mario World.

This sure gives me goosebumps then and it's almost scared me.

Yeah, when you didn't discovered the Top Secret Area, where you can find easily a Cape Feather without going through menacing levels (unless you like using the in-and-out Start + Select trick), it is REALLY hard to defeat Reznor. For me they were once annoying but after you kill one (when the bridge starts breaking) just jump on the stone of the Reznor you defeated!

Added in 1 minute 21 seconds:
SMW Wiggler also. Thanks to a glitch, you can be hurt, and even die, by eating one when riding Yoshi. The only instance where I hate glitches! >:(