Medyo discourteous din naman yung ganun bro, actually.
I know na mali yung nag-hog sa leftmost lane pero don't be an ass at tumutok ka ng tumutok. And delikado rin yun, pano kung biglang mag-brake yung nasa harap because of whatever reason.
Kapag ako may gusto ako patabihin, from afar I flash my headlights na. Kung ayaw tumabi I maintain a quite safe distance from the car in front of me and give him a few beeps and flashes for him to go to the middle lane. Kung ayaw, because sadly not all understand what OVERTAKING lanes are FOR and how does it work, ako nalang lilipat sa middle lane then magoovertake from the right.
Meron akong nakitang YT video na ganyan na nangyari sa Sctex ( ata ), the EK was speeding mga 224kph yata then suddenly a CRV swerved to the left for NO REASON at all.
EDIT: Here's the video
Forward to 1:08 to see the CRV do its stupidity.