The result saw Slavisa Jokanovic's charges drop their first points of the new season. The Kirins - with seven points to their name from three games - now only lead the way courtesy of goal difference from Army United and Pattaya United.
Japanese ace Hironori Saruta handed the Glass Rabbits a 37th minute lead, before Dutchman Adnan Barakat drew Muang Thong level on the stroke of half-time.
One-time Muang Thong favourite Teerathep Winothai then put Bangok Glass ahead on 52 minutes, only for Kone Mohamed to ensure a share of the points with a 78th minute equaliser.
Surprise package Army United continued their fine early season form at the Army Stadium, Tatree Sriha ensuring all three points and taking his side to second place in the table with a 52nd minute strike against Isan United.
Elsewhere, Pattaya United went third thanks to a 1-0 defeat of Thai Port at the Nong Prue Stadium, Rangsarit Suthisa scoring the all-important goal on 72 minutes.
In Wednesday's other matches, Osotspa M-150 Saraburi beat BB-CU 1-0, TOT drew 3-3 with Wuachon United, Insee Police United lost 2-0 to BEC Tero Sasana, and Chiang Rai United downed Samut Songkhram 1-0.