I didn't say it wasn't acceptable.I don't know which minimal dictionary you got that from but it seems to omit the information that spoilt is a perfectly acceptable variant of spoiled as a verb in British English. (source - The OED)
Link us to the official OED entry. Pretty sure subscription costs several hundred ($295) per year. kekeke
spoilt, adj.
Pronunciation: /spɔɪlt/
Etymology: < spoil v.1
= spoiled adj. in various senses.
"spoilt, adj.". OED Online. December 2011. Oxford University Press. 29 February 2012 <http://www.oed.com/viewdictionaryentry/Entry/187277>.
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